Plant Species Regularly Hybridize in Nature,but Only Some Crosses Result

Plant species regularly hybridize in nature,but only some crosses result in new polyploid species.Of the crosses below,if each one occurred,which would be most likely to result in a new stable polyploid species?

A) A cross between a 2n gamete and a 1n gamete,forming a 3n hybrid.
B) A cross between a 4n gamete and a 1n gamete,forming a 5n hybrid.
C) A cross between a species with a CC genome and a species with a DD genome,forming a hybrid with a CD genome.
D) A cross between a species with a BB genome and a species with a DD genome,followed by a doubling of chromosomes,forming a hybrid with a BBDD genome.